pub unsafe fn WsAddCustomHeader(
    message: *const WS_MESSAGE,
    headerdescription: *const WS_ELEMENT_DESCRIPTION,
    writeoption: WS_WRITE_OPTION,
    value: *const c_void,
    valuesize: u32,
    headerattributes: u32,
    error: Option<*const WS_ERROR>
) -> Result<()>